I routinely carry a 4" barreled N frame. For years I used a Bianchi 5bh or Safariland equivalent. The Remington is roughly similar in size but that long barrel will be the hang up. If you shorten it, consider a holster similar to the ones I mentioned. A good belt is a must for any holster.
http://www.bianchi-intl.com/product/Prod.php?TxtModelID=5BH
Another option might be a Pancake from Simply Rugged.
http://www.simplyrugged.com/
Mernickle has a holster for the Model P Colt.
http://www.mernickleholsters.com/ps/ps6sar8.html
I would council you to carry a cartridge revolver but I have been known to carry one of my 1860s so it is not unheard of.
http://www.bianchi-intl.com/product/Prod.php?TxtModelID=5BH
Another option might be a Pancake from Simply Rugged.
http://www.simplyrugged.com/
Mernickle has a holster for the Model P Colt.
http://www.mernickleholsters.com/ps/ps6sar8.html
I would council you to carry a cartridge revolver but I have been known to carry one of my 1860s so it is not unheard of.